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import json
import os
import warnings

from PyQt6 import QtCore
from PyQt6.QtCore import QDir, QFileInfo, QStandardPaths, Qt, QUrl,pyqtSignal as Signal
from PyQt6.QtGui import QIcon, QStandardItem, QStandardItemModel
from PyQt6.QtWidgets import QMenu, QMessageBox, QTreeView

_url_role = Qt.ItemDataRole.UserRole + 1

# Default bookmarks as an array of arrays which is the form
# used to read from/write to a .json bookmarks file
_default_bookmarks = [
    ['Tool Bar'],
    ['http://qt.io', 'Qt', ':/qt-project.org/qmessagebox/images/qtlogo-64.png'],
    ['https://download.qt.io/snapshots/ci/pyside/', 'Downloads'],
    ['https://doc.qt.io/qtforpython/', 'Documentation'],
    ['https://bugreports.qt.io/projects/PYSIDE/', 'Bug Reports'],
    ['https://www.python.org/', 'Python', None],
    ['https://wiki.qt.io/PySide6', 'Qt for Python', None],
    ['Other Bookmarks']
]


def _config_dir():
    location = QStandardPaths.writableLocation(
        QStandardPaths.StandardLocation.ConfigLocation)
    return f'{location}/QtForPythonBrowser'


_bookmark_file = 'bookmarks.json'


def _create_folder_item(title):
    result = QStandardItem(title)
    result.setFlags(Qt.ItemFlag.ItemIsEnabled | Qt.ItemFlag.ItemIsSelectable)
    return result


def _create_item(url, title, icon):
    result = QStandardItem(title)
    result.setFlags(Qt.ItemFlag.ItemIsEnabled | Qt.ItemFlag.ItemIsSelectable)
    result.setData(url, _url_role)
    if icon is not None:
        result.setIcon(icon)
    return result


# Create the model from an array of arrays
def _create_model(parent, serialized_bookmarks):
    result = QStandardItemModel(0, 1, parent)
    last_folder_item = None
    for entry in serialized_bookmarks:
        if len(entry) == 1:
            last_folder_item = _create_folder_item(entry[0])
            result.appendRow(last_folder_item)
        else:
            url = QUrl.fromUserInput(entry[0])
            title = entry[1]
            icon = QIcon(entry[2]) if len(entry) > 2 and entry[2] else None
            last_folder_item.appendRow(_create_item(url, title, icon))
    return result


# Serialize model into an array of arrays, writing out the icons
# into .png files under directory in the process
def _serialize_model(model, directory):
    result = []
    folder_count = model.rowCount()
    for f in range(0, folder_count):
        folder_item = model.item(f)
        result.append([folder_item.text()])
        item_count = folder_item.rowCount()
        for i in range(0, item_count):
            item = folder_item.child(i)
            entry = [item.data(_url_role).toString(), item.text()]
            icon = item.icon()
            if not icon.isNull():
                icon_sizes = icon.availableSizes()
                largest_size = icon_sizes[len(icon_sizes) - 1]
                w = largest_size.width()
                icon_file_name = f'{directory}/icon{f:02}_{i:02}_{w}.png'
                icon.pixmap(largest_size).save(icon_file_name, 'PNG')
                entry.append(icon_file_name)
            result.append(entry)
    return result


# Bookmarks as a tree view to be used in a dock widget with
# functionality to persist and populate tool bars and menus.
class BookmarkWidget(QTreeView):
    """Provides a tree view to manage the bookmarks."""

    open_bookmark = Signal(QUrl)
    open_bookmark_in_new_tab = Signal(QUrl)
    changed = Signal()

    def __init__(self):
        super().__init__()
        self.setRootIsDecorated(False)
        self.setUniformRowHeights(True)
        self.setHeaderHidden(True)
        self._model = _create_model(self, self._read_bookmarks())
        self.setModel(self._model)
        self.expandAll()
        self.activated.connect(self._activated)
        self._model.rowsInserted.connect(self._changed)
        self._model.rowsRemoved.connect(self._changed)
        self._model.dataChanged.connect(self._changed)
        self._modified = False

    def _changed(self):
        self._modified = True
        self.changed.emit()

    def _activated(self, index):
        item = self._model.itemFromIndex(index)
        self.open_bookmark.emit(item.data(_url_role))

    def _action_activated(self, index):
        action = self.sender()
        self.open_bookmark.emit(action.data())

    def _tool_bar_item(self):
        return self._model.item(0, 0)

    def _other_item(self):
        return self._model.item(1, 0)

    def add_bookmark(self, url, title, icon):
        self._other_item().appendRow(_create_item(url, title, icon))

    def add_tool_bar_bookmark(self, url, title, icon):
        self._tool_bar_item().appendRow(_create_item(url, title, icon))

    # Synchronize the bookmarks under parent_item to a target_object
    # like QMenu/QToolBar, which has a list of actions. Update
    # the existing actions, append new ones if needed or hide
    # superfluous ones
    def _populate_actions(self, parent_item, target_object, first_action):
        existing_actions = target_object.actions()
        existing_action_count = len(existing_actions)
        a = first_action
        row_count = parent_item.rowCount()
        for r in range(0, row_count):
            item = parent_item.child(r)
            title = item.text()
            icon = item.icon()
            url = item.data(_url_role)
            if a < existing_action_count:
                action = existing_actions[a]
                if (title != action.toolTip()):
                    action.setText(BookmarkWidget.short_title(title))
                    action.setIcon(icon)
                    action.setToolTip(title)
                    action.setData(url)
                    action.setVisible(True)
            else:
                short_title = BookmarkWidget.short_title(title)
                action = target_object.addAction(icon, short_title)
                action.setToolTip(title)
                action.setData(url)
                action.triggered.connect(self._action_activated)
            a = a + 1
        while a < existing_action_count:
            existing_actions[a].setVisible(False)
            a = a + 1

    def populate_tool_bar(self, tool_bar):
        self._populate_actions(self._tool_bar_item(), tool_bar, 0)

    def populate_other(self, menu, first_action):
        self._populate_actions(self._other_item(), menu, first_action)

    def _current_item(self):
        index = self.currentIndex()
        if index.isValid():
            item = self._model.itemFromIndex(index)
            if item.parent():  # exclude top level items
                return item
        return None

    def context_menu_event(self, event):
        context_menu = QMenu()
        open_in_new_tab_action = context_menu.addAction("Open in New Tab")
        remove_action = context_menu.addAction("Remove...")
        current_item = self._current_item()
        open_in_new_tab_action.setEnabled(current_item is not None)
        remove_action.setEnabled(current_item is not None)
        chosen_action = context_menu.exec(event.globalPos())
        if chosen_action == open_in_new_tab_action:
            self.open_bookmarkInNewTab.emit(current_item.data(_url_role))
        elif chosen_action == remove_action:
            self._remove_item(current_item)

    def _remove_item(self, item):
        message = f"Would you like to remove \"{item.text()}\"?"
        button = QMessageBox.question(self, "Remove", message,
                                      QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No)
        if button == QMessageBox.StandardButton.Yes:
            item.parent().removeRow(item.row())

    def write_bookmarks(self):
        if not self._modified:
            return
        dir_path = _config_dir()
        native_dir_path = QDir.toNativeSeparators(dir_path)
        directory = QFileInfo(dir_path)
        if not directory.isDir():
            print(f'Creating {native_dir_path}...')
            if not QDir(directory.absolutePath()).mkpath(directory.fileName()):
                warnings.warn(f'Cannot create {native_dir_path}.',
                              RuntimeWarning)
                return
        serialized_model = _serialize_model(self._model, dir_path)
        bookmark_file_name = os.path.join(native_dir_path, _bookmark_file)
        print(f'Writing {bookmark_file_name}...')
        with open(bookmark_file_name, 'w') as bookmark_file:
            json.dump(serialized_model, bookmark_file, indent=4)

    def _read_bookmarks(self):
        bookmark_file_name = os.path.join(QDir.toNativeSeparators(_config_dir()),
                                          _bookmark_file)
        if os.path.exists(bookmark_file_name):
            print(f'Reading {bookmark_file_name}...')
            return json.load(open(bookmark_file_name))
        return _default_bookmarks

    # Return a short title for a bookmark action,
    # "Qt | Cross Platform.." -> "Qt"
    @staticmethod
    def short_title(t):
        i = t.find(' | ')
        if i == -1:
            i = t.find(' - ')
        return t[0:i] if i != -1 else t
